41
Installation and Maintenance
Service Manual
Outdoor ambient
temperature sensor is
open/short circuited
F3
During cooling and drying operating,
compressor stops while indoor fan
operates; During heating operation, the
complete unit will stop operation
Outdoor temperature sensor hasnt been connected well or is
damaged. Please check it by referring to the resistance table
for temperature sensor)
Outdoor condenser
temperature sensor is
open/short circuited
F4
During cooling and drying operation,
compressor stops while indoor fan will
operate; During heating operation, the
complete unit will stop operation.
Outdoor temperature sensor hasnt been connected well or is
damaged. Please check it by referring to the resistance table
for temperature sensor)
Outdoor discharge
temperature sensor is
open/short circuited
F5
During cooling and drying operation,
compressor will sop after operating for
about 3 mins, while indoor fan will operate;
During heating operation, the complete unit
will stop after operating for about 3 mins.
1.Outdoor temperature sensor hasnt been connected well
or is damaged. Please check it by referring to the resistance
table for temperature sensor)
2.The head of temperature sensor hasnt been inserted into
the copper tube
Limit/decrease
frequency due to
overload
F6
All loads operate normally, while operation
frequency for compressor is decreased
Refer to the malfunction analysis (overload, high temperature
resistant)
Decrease frequency
due to overcurrent
F8
All loads operate normally, while operation
frequency for compressor is decreased
The input supply voltage is too low; System pressure is too
high and overload
Decrease frequency
due to high air
discharge
F9
All loads operate normally, while operation
frequency for compressor is decreased
Overload or temperature is too high; Refrigerant is
insufcient; Malfunction of electric expansion valve (EKV)
Limit/decrease
frequency due to
antifreezing
FH
All loads operate normally, while operation
frequency for compressor is decreased
Poor air-return in indoor unit or fan speed is too low
Voltage for DC bus-
bar is too high
PH
During cooling and drying operation,
compressor will stop while indoor fan will
operate; During heating operation, the
complete unit will stop operation.
1. Measure the voltage of position L and N on wiring board
(XT), if the voltage is higher than 265VAC, turn on the unit
after the supply voltage is increased to the normal range.
2.If the AC input is normal, measure the voltage of electrolytic
capacitor C on control panel (AP1), if its normal, theres
malfunction for the circuit, please replace the control panel
(AP1)
Voltage of DC bus-bar
is too low
PL
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop
1. Measure the voltage of position L and N on wiring board
(XT), if the voltage is higher than 150VAC, turn on the unit
after the supply voltage is increased to the normal range.
2.If the AC input is normal, measure the voltage of electrolytic
capacitor C on control panel (AP1), if its normal, theres
malfunction for the circuit, please replace the control panel
(AP1)
Compressor Min
frequence in test state
P0 Showing during min. cooling or min. heating test
Compressor rated
frequence in test state
P1 Showing during nominal cooling or nominal heating test
Compressor maximum
frequence in test state
P2 Showing during max. cooling or max. heating test
Compressor
intermediate
frequence in test state
P3 Showing during middle cooling or middle heating test
Overcurrent protection
of phase current for
compressor
P5
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop operation.
Refer to the malfunction analysis (IPM protection, loss of
synchronism protection and overcurrent protection of phase
current for compressor.
Charging malfunction
of capacitor PU
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop
Refer to the part three—charging malfunction analysis of
capacitor
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